Patent US3905270A successfully refreshed from Google Patents.
US3905270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-piece fastening element
Assignee: Illinois Tool Works Inc
•
Filing: 1974-07-10
•
Granted: 1975-09-16
•
Expires: 1994-07-10
Abstract
Abstract A one-piece fastening element comprising a head and a shank adapted to be inserted into an aperture in a workpiece. The shank comprises a plurality of spring legs having a stepped contour adapted to engage the other side of the workpiece.
Inventors
- 👤 Klaus Friedrich Hehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
F; F16; F16B; F16B21/00; F16B21/06; F16B21/08; F16B21/086; Y; Y10; Y10S; Y10S411/00; Y10S411/913
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
A one-piece fastening elemenT made from synthetic material which is adapted to be inserted in a fastening aperture of a complementary workpiece in a self-retaining manner, comprising a head adapted to lie in close proximity to one side of the complementary apertured workpiece and a shank extending from said head and adapted to be introduced into the fastening aperture, said shank consisting of three spring legs formed integrally with the head and united at their terminal end to form an entering end portion, said three spring legs each provided with a step-like shoulder intermediate said head and said entering end portion adapted to engage the surface of the complementary apertured workpiece opposite the surface engaged by said head, said legs being pentagonal in cross-section from the vicinity of said head portion to the terminal entering portion and diminishing in cross-sectional area in the same direction, the pentagonal peak of each of said legs facing inwardly in the direction of the axis of the fastener, said three legs being separated by slots in said shank which have a circumferential dimension at least equal to the circumferential measurement of each of said legs.
Claim 2
Dependent Claim
191 words
A one-piece fastening elemenT made from synthetic material which is adapted to be inserted in a fastening aperture of a complementary workpiece in a self-retaining manner, comprising a head adapted to lie in close proximity to one side of the complementary apertured workpiece and a shank extending from said head and adapted to be introduced into the fastening aperture, said shank consisting of three spring legs formed integrally with the head and united at their terminal end to form an entering end portion, said three spring legs each provided with a step-like shoulder intermediate said head and said entering end portion adapted to engage the surface of the complementary apertured workpiece opposite the surface engaged by said head, said legs being pentagonal in cross-section from the vicinity of said head portion to the terminal entering portion and diminishing in cross-sectional area in the same direction, the pentagonal peak of each of said legs facing inwardly in the direction of the axis of the fastener, said three legs being separated by slots in said shank which have a circumferential dimension at least equal to the circumferential measurement of each of said legs.
Claim 3
Dependent Claim
38 words
A one-piece fastening element of the type described in claim 1 wherein the greatest cross-sectional dimension of said three legs having a pentagonal cross-section is greatest in the vicinity of the step-like shoulder on each of said legs.
Claim 4
Dependent Claim
71 words
A one-piece fastening element of the type described in claim 1 wherein the circumferential dimension of each of said three spring legs having approximately the same circumferential dimension throughout their length having a diminishing radial thickness from the vicinity of said head to the entering end portion of the fastener whereby said pentagonal cross-sectional area diminishes from the vicinity of said head portion in a direction toward said entering end portion.
Claim 5
Dependent Claim
40 words
A one-piece fastening element of the type described in claim 1 wherein the step-like shoulder portion of each of said three spring legs is an arc of a circle in cross-section spaced equally outwardly from the axis of the fastener.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |